Diborylation of Alkynyl MIDA Boronates and Sequential Chemoselective Suzuki-Miyaura Couplings: A Formal Carboborylation of Alkynes

Platinum-catalyzed diborylation of phenylethynyl MIDA boronate with B-pin-B-pin proceeds to yield 1,1,2-triboryl-2-phenylethene with two different classes of the boron functionalities. Sequentially, the obtained 1,1,2-triboryl-2-phenylethene are subjected to Suzuki-Miyaura coupling to introduce a series of aryl groups chemoselectively to afford 1,1-boryl-2,2-diarylethenes.